function ccwstree_showTreeBranch(branch) {
  var objBranch = document.getElementById('tree_branch_' + branch).style;
  var objImg = document.getElementById('tree_img_' + branch);
  if (objBranch.display != "none") {
    objBranch.display = "none";
    objImg.src = '/system/ccwstree/images/expand.gif';
  } else {
    objBranch.display = "block";
    objImg.src = '/system/ccwstree/images/collapse.gif';
  }
}